Sprains mostly refer to ankle sprains, ankle sprains two months do not reduce the swelling of common causes are premature activities, fractures and ligament rupture. 1. Ankle sprains without adequate rest or premature weight-bearing activities, may lead to increasing damage, edema can not be absorbed. At this time, you need to rest, less activity, elevate the lower limbs, promote blood return to help reduce swelling. 2. If there are more serious injuries such as fracture and ligament rupture, because the recovery period of fracture and ligament is longer, the edema may persist until the injury recovers. Oral non-steroidal anti-inflammatory drugs such as diclofenac sodium extended-release tablets can be taken, plaster immobilization and braking of the lower limb, and surgery is needed for serious cases. There are more reasons why the swelling does not go down after a sprain, it may also be related to gouty arthritis, acute kidney injury and other diseases, it is recommended to consult a doctor in time, to clarify the cause of the disease, and to carry out targeted treatment.